NoMethodError in SearchesController#results

undefined method `split' for nil:NilClass

Extracted source (around line #265):
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@term = search_params[:term]
if ['corpname', 'persname'].include?(AccessTerm.find(search_params[:access_term_id]).term_type)
@term = @term.split(' -- ')[0]
end
@url_extension[:access_term_id] = search_params[:access_term_id]
@url_extension[:term] = @term

Rails.root: /home/app/data_archives

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Request

Parameters:

{"prefilter"=>"access_term_id", "access_term_id"=>"34818"}

Response

Headers:

None